feat: implement login auth for all

also show the username underneath the logo

src/App.tsx

@@ -14,14 +14,10 @@ function App() {
     <BrowserRouter>
       <SessionProvider>
         <Header />
-        <Avatar />
         <Routes>
           <Route index element={<Rankings />} />
-
           <Route path="/network" element={<GraphComponent />} />
-
           <Route path="/analysis" element={<Analysis />} />
-
           <Route path="/mvp" element={<MVPChart />} />
         </Routes>
         <Footer />